Spinning chamber air outlet



Dec- 12, 1967 v. ZLEVOR ETAL 3,357,168

SPINNING CHAMBER AIR OUTLET Filed Dec.

lla

United States Patent O 3,357,168 SPINNING CHAMBER AH?. DU'ILET VratislavZlevor, Usui nad Orlici, Karel Zavadsky, Hnatnice, Miioslav Kuhovy,Dolni Dobrouc, and Josef Stai-y and Erik .lirasek, Usti nad Orlici,Czechoslovakia, assigner-s to Vyzkumny Ustav Bavlnarsky, Usti nadOrlici, Czechoslovakia Filed Dec. 7, 1966, Ser. No. 599,941 Claimspriority, application Czechoslovakia, Dec. 7, 1965, 7,333/ 65 6 Claims.(Cl. 57-58.S9)

ABSTRACT QF THE DISCLQSURE rl`he air escape openings of a rotaryspinning chamber are spaced to prevent clogging by fibers.

Background of the invention The present invention relates to rotaryspinning chambers of the type in which textile fibers are supplied to acircular collecting surface and are spun on the same into a twisted yarnwhich is delivered through a central stationary delivery channel to apair of transporting rollers.

Due to the rotation of the spinning chamber, air is discharged throughthe escape openings and sucked into the spinning chamber together withfibers. Some of the fibers which are not spun into a yarn, escapethrough the escape openings, particularly fibers whose length is shorterthan the standard or average length of the fibers.

In constructions according to the prior art, the shorter fibers arefrequently simultaneously caught at both ends by two escape openings sothat they are held on the intermediate wall portion without being ableto escape together with the air passing through the escape openings. Inthe course of the spinning operation, fibers are accumulated on the wallportion where the escape openings are provided, and gradually clog theescape openings, preventing the escape of air and causing reduced airflow into and out of the spinning chamber, resulting finally in thespinning of a yarn of poor quality.

Summary of the invention It is an object of the invention to overcomethese disadvantages of spinning chambers according to the prior art, andto prevent the clogging of air escape openings by fibers.

Another object of the invention is to dispose the air escape openings ofa rotary spinning chamber in such a manner that fibers cannot be caughtat both ends in adjacent escape openings.

With these objects in View, the present invention relates to a rotaryspinning chamber having an inlet for fibers and air, and a wall formedwith a plurality of escape openings for air and fibers driven outward bythe centrifugal force. In accordance with the invention, the escapeopenings are spaced from each other such a predetermined distance thatone end of a fiber blown toward the wall cannot enter an escape openingwhen the other end of the fiber has entered another escape opening. Inthis manner, clogging of the escape openings by fibers having the endsthereof located in two escape openings is prevented.

In the preferred embodiment of the invention, the distance betweenadjacent escape openings is greater than one-third of the standardlength of the fibers.

Since also fibers shorter than standard fibers enter the spinningchamber, the distance between two adjacent escape openings is selectedso that when one end of any one of the shorter fibers enters an escapeopening, the other end of the iiber is located on the wall between therespective escape opening and the next adjacent escape ICC opening, andis safely blown out of the escape opening in which its end is located.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawings.

Brief description of the drawing FIG. 1 is a fragmentary schematic axialsectional view illustrating an embodiment of a spinning chamber providedwith the improvement of the invention; and

FIG. 2 is a fragmentary plan view of the embodiment, partially shown incross section.

Description of the preferred embodiment Referring now to the drawing, aspinning chamber 1 is carried by drive shaft 2 and rotated about itsaxis. The spinning chamber has a circular collecting surface 6 formed bytwo intersecting frusto-conical surfaces and located in the region ofthe greatest diameter of the spinning chamber. A stationary body 12 hasa portion 13 projecting into the spinning chamber, and is formed with aninlet channel 4 through which fibers 5 are supplied into the interior ofthe spinning chamber to be spun at the collecting surface 6 into a yarn7 which is transported by a pair of rollers 9 through a delivery channel8 disposed coinciding with the axis of rotation of spinning chamber 1.Winding means, not shown, wind up the yarn 7 to form a package 10.

The spinning. chamber has circumferentially spaced outlet channels 3which open on the inner surface of the spinning chamber incircumferentially spaced air escape openings 11 located in a planeperpendicular to the axis of rotation of the spinning chamber.

During rotation of the spinning chamber, the centrifugal force moves airthrough the escape openings and outlet channels, and sucks air andfibers 5 through the inlet channel 4. The fibers are spun on thecollecting surface 6 into the yarn 7, a portion of which revolves withthe spinning chamber, while another portion passing through the deliverychannel 8 to the transporting rollers 9, is twisted.

The fibers 5 are obtained by a known and conventional combing rollerwhich combs the fibers out of a sliver. Most of the Ifibers are of astandard length, while other fibers are shorter. Those fibers which arenot spun into the yarn on collecting surface 6 should escape through theescape openings 11 and outlet channels 3 in order to prevent clogging ofthe spinning chamber.

However, if the ends of a loose fiber simultaneously enter two adjacentescape openings, the respective fiber -is neither blown out of one orthe other escape opening, but is pressed against the wall portion 11abetween two adjacent escape openings 11. I-f a great number of fibers isthus accumulated on the inner Wall portions 11a around the circumferenceof the spinning chamber, the escape openings and outlet channels becomeclogged, and even fibers entering only with one end into an escapeopening cannot be blown out, so that finally the air is prevented fromproperly escaping through the outlet channels 11 and the operation ofthe spinning chamber is impaired.

In accordance with the invention, the distance a between adjacent escapeopenings 11 is selected so that one end of a short fiber blown toward awall portion 11a, cannot enter an escape opening when the other end ofthe fiber has already entered another escape opening. Particularly, itis preferred that the distance a between two adjacent escape openings 11is greater than one-third of the standard length of the fibers Ssupplied into the spinning chamber. Fibers of shorter length thandistance a cannot be caught simultaneously in two adjacent escapeopenings 11 so that the main reason for the clogging of the escapeopenings is eliminated, and disturbances of the spinning operation dueto clogging of the outlet channels is prevented. Fibers having a greaterlength than one-third of the standard length of most supplied fibers,have sufficient mass to be thrown onto collecting surface 6 by thecentrifugal force, while shorter fibers have a smaller mass and tend tofioat in the spinning chamber toward openings 11.

A short fiber 4 which was not held on the collecting surface 6, or didnot reach the same, can enter only with one end into an escape opening11, and is immediately and quickly blown by the stream of air passingthrough the respective escape opening an outlet channel out of thespinning chamber.

It is evident that the distance a between adjacent circumferentiallyspaced escape openings 11a will be selected in accordance with thelength of the fibers produced by the particular combining device, andwill be selected so that the greatest possible number of short fibers,which are not spun into a yarn, cannot enter with both ends intoadjacent escape openings.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofrotary spinning chambers differing from the types described above.

While the invention has been illustrated and described as embodied in aspinning chamber having air escape openings spaced to prevent engagementof two adjacent escape openings by vthe ends of a fiber, it is notintended to be limited to the details shown, since various modificationsand structural changes may be made without departing in any way from thespirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior art, fairly constitute essentialcharacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims:

1. A rotary spinning chamber having an inlet for fibers and air, and awall formed with a plurality of escape openings for air and fibersdriven outward by the centrifugal force, wherein said escape openingsare spaced from each other such a predetermined distance that one end ofa fiber blown toward said wall cannot enter an escape opening when theother end of the fiber has entered another escape opening wherebyclogging of said escape openings by fibers having the ends thereoflocated in two escape openings is prevented.

2. Rotary spinning chamber as dened in claim 1 coinprising means forsupplying fibers having a predetermined standard length into saidspinning chamber; and wherein said predetermined distance betweenadjacent escape openings is greater than one third of said standardlength of said fibers.

3. Rotary spinning chamber as defined in claim 1 comprising means forsupplying standard fibers and shorter fibers into said spinning chamber;and wherein said predetermined distance is selected so that one end ofany one of said shorter fibers whose other end enters one of said escapeopenings is located on said wall between said one escape opening and theescape opening adjacent the same so that the respective shorter liber isblown out of said escape opening.

4. Rotary spinning chamber as defined in claim 1 wherein said wall has afrusto-conical inner surface in which said escape openings are locatedcircumferentially spaced from each other said predetermined distance.

A5. Rotary spinning chamber as defined in claim 4 wherein said wall hasoutlet channels extending in radial direction with respect to the axisof rotation of said rotary spinning chamber, and terminating at saidinner rusto-conical surfaces in said escape openings.

6. Rotary spinning chamber as defined in claim 5 wherein said escapeopenings and said outlet channels have a circular cross section.

References Cited UNITED STATES PATENTS 3,121,306 2/1964 Cizek et al57-58.89 3,163,976 1/1965 Juiliard 57--58.89 3,328,949 7/1967 Pavek etal. 57-88.89

JOHN PETRAKES, Primary Examiner.

1. A ROTARY SPINNING CHAMBER HAVING AN INLET FOR FIBERS AND AIR, AND AWALL FORMED WITH A PLURALITY OF ESCAPE OPENINGS FOR AIR AND FIBERSDRIVEN OUTWARD BY THE CENTRIFUGAL FORCE, WHEREIN SAID ESCAPE OPENINGSARE SPACED FROM EACH OTHER SUCH A PREDETERMINED DISTANCE THAT ONE END OFA FIBER BLOWN TOWARD SAID WALL CANNOT ENTER AN ESCAPE OPENING WHEN THEOTHER END OF THE FIBER HAS ENTERED ANOTHER ESCAPE OPENING WHEREBYCLOGGING OF SAID